Refactor xonsh config

xonsh/python.xsh

@@ -0,0 +1,17 @@
+def _vv():
+    """Finds the nearest venv going upward in the directory hierarchy and activates it."""
+    d = Path.cwd()
+
+    while True:
+        if (d / "venv").exists():
+            vox activate @(str(d / "venv"))
+            return True
+
+        if d == d.parent or (d / ".git").exists():
+            print("Could not find venv.")
+            return False
+
+        d = d.parent
+
+
+aliases["vv"] = _vv